-July 2024 Special Lease Deals-

2024 Chevy Blazer EV lease from Bayway Auto Group Click here

2024 Jeep Grand Cherokee lease from Mark Dodge Click here

2025 Ram 1500 Factory Order Discounts from Mark Dodge Click here

2005 Blazer AC compressor cycling

ryaninvancouveryaninvancouve Member Posts: 1
edited March 2014 in Chevrolet
Hi all, TIA for any ideas you may have...

My Blazer (4.3L) started cycling the AC compressor for no apparent reason. With climate controls and defrost off at idle I was hearing a click (compressor clutch engaging) and idle would jump 300rpm. It will cycle every 3 seconds on and off. My dealer saw it and says it isn't a problem, the compressor will just decide to come on for unknown reasons. He says as long as no dash lights come on it isn't a problem. I think they're idiots who have no idea how to troubleshoot the system. My warranty is up next month so any ideas on what might be causing this would be greatly appreciated!




  • Options
    jlflemmonsjlflemmons Member Posts: 2,242
    You are correct, they are idiots. Obviously, the compressor clutch is getting a command to engage from somewhere, and if the controls are all off, there is a short somewhere. One trick would be to pull the ac controls and disconnect them. If the compressor continues to cycle, there be a short somewhere. While the idle is computer controlled, and does pick up when the compressor kicks in, I can't speak to where the compressor clutch signal comes from. Could be direct from the a/c controls, or the controls could be telling the computer and the body computer is turning on the clutch.
This discussion has been closed.